ORIGINAL: Foxy
As above, only I'm pretty sure you need the 44t spur with the 19 tooth pinion, at least, that's how it is with FG, maybe not the FH, I dunno, I just thought I'd throw that out there.
Different:
http://www3.towerhobbies.com/cgi-bin...&I=LXHTU9&P=ML
You can see the "48" imprinted on the Spur Gear. Anything else won't mesh.
The spur/pinion sold at Innovative is also a 19/48 tooth combo.